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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<TITLE>dup</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>DUP(2) Linux Programmer's Manual DUP(2)
+</h3>
+
+<h3>NAME
+</h3> dup, dup2 - duplicate a file descriptor
+
+<h3>SYNOPSIS
+</h3> #include &lt;unistd.h&gt;
+
+ int dup(int oldfd);
+ int dup2(int oldfd, int newfd);
+
+<h3>DESCRIPTION
+</h3> dup and dup2 create a copy of the file descriptor oldfd.
+
+ The old and new descriptors may be used interchangeably.
+ They share locks, file position pointers and flags; for
+ example, if the file position is modified by using lseek
+ on one of the descriptors, the position is also changed
+ for the other.
+
+ The two descriptors do not share the close-on-exec flag,
+ however.
+
+ dup uses the lowest-numbered unused descriptor for the new
+ descriptor.
+
+ dup2 makes newfd be the copy of oldfd, closing newfd first
+ if necessary.
+
+<h3>RETURN VALUE
+</h3> dup and dup2 return the new descriptor, or -1 if an error
+ occurred (in which case, errno is set appropriately).
+
+<h3>ERRORS
+</h3> EBADF oldfd isn't an open file descriptor, or newfd is
+ out of the allowed range for file descriptors.
+
+ EMFILE The process already has the maximum number of file
+ descriptors open and tried to open a new one.
+
+<h3>WARNING
+</h3> The error returned by dup2 is different to that returned
+ by fcntl(...,F_DUPFD,...) when newfd is out of range. On
+ some systems dup2 also sometimes returns EINVAL like
+ F_DUPFD.
+
+<h3>CONFORMING TO
+</h3> SVID, AT&T, POSIX, X/OPEN, BSD 4.3
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=fcntl.htm>fcntl</a>,
+<a href=open.htm>open</a>,
+<pre>
+
+
+
+
+
+
+
+
+<h3>Linux 1.1.46 21 August 1994 1
+</h3>
+
+ </pre>
+<P>
+<hr>
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